Fuel injector sleeve cutting guide

ABSTRACT

A GUIDE MEANS FOR USE IN CUTTING FUEL INJECTOR SLEEVES FROM DIESEL ENGINES COMPRISING A GUIDE PLATE WHICH IS SECURED TO THE CYLINDER HEAD BY MEANS OF HEAD BOLTS EXTENDING THROUGH THE CYLINDER HEAD AND BEING THREADABLY RECEIVED BY THE PLATE. A PLURALITY OF SPACED APART STUDS ARE ADJUSTABLY MOUNTED ON THE PLATE AND ARE POSITIONED BELOW THE COPPER INJECTOR SLEEVE IN THE HEAD. THE STUDS ARE ADAPTED TO LIMIT THE DEPTH TO WHICH THE SLEEVE CUTTING TOOL CAN EXTEND INTO THE FUEL INJECTOR OPENING AND ALSO SERVE AS A GUIDE FOR THE SAME.

Jan. 26, 1971 J; A. BURGESS FUEL INJECTOR SLEEVE CUTTING GUIDE Filed-Sept. 5, 1968 Mme/v70? Jo /v ,4 5020555 5y 5 firraP/vy/s United StatesPatent 3,557,464 FUEL INJECTOR SLEEVE CUTTING GUIDE John A. Burgess,5645 NW. 1st St., Des Moines, Iowa 50313 Filed Sept. 5, 1968, Ser. No.757,658 Int. Cl. G01b 3/30 US. Cl. 33-180 6 Claims ABSTRACT OF THEDISCLOSURE A guide means for use in cutting fuel injector sleeves fromdiesel engines comprising a guide plate which is secured to the cylinderhead by means of head bolts extending through the cylinder head andbeing threadably received by the plate. A plurality of spaced apartstuds are adjustably mounted on the plate and are positioned below thecopper injector sleeve in the head. The studs are adapted to limit thedepth to which the sleeve cutting tool can extend into the fuel injectoropening and also serve as a guide for the same.

Conventional diesel engines such as the Cummins V-6 or V-8 engine havecopper sleeves embracing the fuel injectors utilized therein. It is alsonecessary to replace these sleeves for proper engine performance.Heretofore, the'sleeves have been simply cut or bored from their seatsin the fuel injector bore by a mechanic operating a rotary cutting toolwithout any guide means or jig being utilized. Previously, the cylinderhead was simply removed from the engine block and placed on a supportingsurface such as the ground or the like. The cutting operation was thenperformed by alternately drilling and inserting a gauge, etc. until thedesired cut was accomplished. The tolerances on such a cut aremaintained between 0.095 to 0.125 inch.

It is imperative that the proper out be provided so that the proper fuelinjection can be accomplished. If the cut is too deep, the fuel injectorwill extend too far into the cylinder and conversely, the fuel injectorwill not extend sufficiently into'the cylinder if the cut is tooshallow. If the sleeve is not seated correctly, the injectorcorrespondingly is not seated correctly and the spray of fuel into thefiring chamber is either against the dome or towards the top of thefiring chamber. There must be turbulance in the firing chamber and ineither of the extreme conditions mentioned above such turbulance isabsent. The second important reason for obtaining a precise boring is toachieve a perfect seal between the injector and the sleeve and betweenthe sleeve and the bore.

Therefore, it is a principal object of this invention to provide a meansfor cutting fuel injector sleeves from diesel engines.

A further object of this invention is to provide a method for cuttingthe fuel injector sleeve from diesel engines.

A further object of this invention is to provide a guide plate meanswhich is secured to a diesel engine cylinder head to facilitate theproper cutting of the fuel injector sleeves therefrom.

A further object of this invention is to provide a guide plate means forcutting fuel injector sleeves from diesel engines which limits the depthto which the cutting tool can extend.

A further object of this invention is to provide a guide plate means foruse in cutting fuel injector sleeves from diesel engines wherein theplate is secured to the cylinder head by means of the cylinder headbolts.

A further object of this invention is to provide a guide means for usein cutting fuel injector sleeves from 3,557,464 Patented Jan. 26, 1971diesel engines which is economical of manufacture, durable m use andrefined in appearance.

These and other objects will be apparent to those skilled in the art.

This invention consists in the construction, arrangements, andcombination of the various parts of the device, whereby the objectscontemplated are attained as hereinafter more fully set forth,specifically pointed out in the claims ,and illustrated in theaccompanying drawings in which:

FIG. 1 is a partial exploded perspective view of a diesel enginecylinder head and the guide plate of this invention;

FIG. 2 is a partial sectional view of the cylinder head illustrating therelationship between the fuel injector, fuel injector sleeve and thecylinder head;

FIG. 3 is an enlarged sectional view of the guide plate as seen alonglines 3--3 of FIG. 1; and

FIG. 4 is a fragmentary sectional view illustrating the guide platebeing secured to the cylinder head and illustrating a stud on the guideplate limiting the depth of the cutting tool.

The numeral 10 generally designates the cylinder head assembly for adiesel engine such as a Cummins V6 or V-8. Head assembly 10 includes ahead 12 having a plurality of head bolt openings 14 formed thereinadapted to receive head bolts 16 extending therethrough which areutilized to mount the head 12 on the engine block (not shown). Theparticular head 12 shown in FIG. lincludes four injector bores 18, 20,22 and 24 formed therein which are adapted to receive fuel injectors 26,28, 30 and 32 therein respectively. A copper injector sleeve 34 ismounted in the lower end of each of the bores 18, 20, 22 and 24 andembraces the lower end of the fuel injectors as illustrated in FIG. 2.Each of the fuel injectors includes an injector link 36, injector spring38, O-ring seals 40, 42, 44 and 46 mounted on body portion 48, cup 50,injector cup tip 52, fuel intake means 54 and fuel discharge means 56.The fuel injector 26 is mounted on the head 12 by means of a mountingplate 58 fastened to the head with bolts 60 and 62. The numeral 64generally designates a valve assembly which is provided on the headadjacent fuel injector 32. The valve assembly for the fuel injectors 26,28 and 30 has not been shown in FIG. 1 for purposes of clarity.

The numeral 66 generally designates the guide plate of this inventionand includes a top 68, opposite ends 70 and 72, and opposite sides 74and 76. A pair of legs 78 and 80 are secured to and extend downwardlyfrom top 68 at sides 74 and 76 respectively. A plurality of nuts 82 arewelded to the top surface of top "68- and register with threadedopenings 84 formed in plate 66. In the particular plate 66 shown in FIG.1, there are 8 nuts 82 mounted on the plate adapted to register with theopenings 14 in the head 12. Nuts 82 are preferably of inch S.A.E. highhex construction. In the particular plate 66 illustrated in FIG. 1, fourstuds 86 are mounted on the plate 66 and have a stop button 88 at theirupper ends. Nuts 90 are welded to the bottom surface of top 68 andthreadably receive the studs 86 extending therethrough. The studs 86 arepositioned on the plate 66 so that the buttons 88 are located directlybelow the openings 18, 20, 22 and 24. Preferably, the studs 86 are inchS.A.E. and have a length of 1% inches. The numeral 81 designates twoguide posts provided in plate 66 (FIG. 1).

The head 12 illustrated in FIG. 1 is for a V-8 Cummins diesel engine andthus four studs 86 and 10 nuts 82 are required. If the head is for a V-6engine, Only three studs 86 would be required. Preferably, the top 68 isof steel construction and is 11 inches wide, 30 inches long and inchthick when the plate is used on a V-8 Cummins diesel engine. The legs 78and 80 are preferably two inches wide, 30 inches long and We inch thickwhen the plate is used with the Cummins V-8 engine.

The sleeves 34 are cut from the head 12 in the following manner. Thehead 12 is removed from the engine block in convential fashion. Theplate '66 is positioned below the head 12 and the head bolts 16 areinserted through the openings 14 and are threadably secured to the nuts82 (FIG. 4). The fuel injectors 26, 28, 30 and 32 are removed from thehead in conventional fashion. It should be noted that the fuel injectorscould have been removed from the head 12 prior to the head 12 beingsecured to the plate 66. The cutting tool which is generally designatedby the reference numeral 92 is then inserted into the bore 18 so thatthe sleeve 34 is cut therefrom. The depth to which the cutting tool 92can extend into the opening 18 is limited by the stop button 88 on thestud 86 as illustrated in FIG. 4. The lower tip of the cutting tool 92engages the upper end of the stop button 88 and thus prevents thecutting tool from extending too far into the bore 18. Likewise, themechanic knows that he must continue to operate the cutting tool untilthe stop button 88 is encountered by the cutting tool 92. The cuttingtool 92 is then removed from the bore 18 and a. new injector sleeve Willbe inserted into the bore 18. The cutting operation is then performed inall of the bores which require new sleeves. It should be noted that thecutting depth of the tool 92 can be controlled by the adjustment of thestud 86 with respect to the plate 66. The head bolts 16 securelymaintain the plates 66 on the head 12 and precisely position the plate'66 with respect to the head 12. The limiting action of the stop buttons88 insures that the sleeve 34 will be properly cut from the bore 18 andthat the new sleeve will be correctly seated therein. The guide plate ofthis invention insures that the injector cup tip 52 will extend into thefiring chamber of the proper distance and that a proper seat is providedbetween the fuel injector and the sleeve and between the sleeve and thebore. The guide plate of this invention and the method described hereinpermits the sleeves to be cut from the cylinder head much more rapidlythan was heretofore possible and with a much higher degree of accuracy.Thus it can be seen that the device accomplishes at least all of itsstated objectives.

Some changes may be made in the construction and arrangement of my fuelinjector sleeve cutting guide and method of using same without departingfrom the real spirit and purpose of my invention, and it is my intentionto cover by my claims, any modified forms of structure or use ofmechanical equivalents which may be reasonably included within theirscope.

I claim:

1. A guide plate for use in cutting fuel injector sleeves from a dieselengine head assembly, comprising:

a rectangular plate having opposite side edges, opposite ends, and topand bottom surfaces,

first and second legs secured to said opposite side edges respectivelyand extending downwardly therefrom, said plate having a plurality ofspaced apart first openings formed therein adapted to register with atleast some of the head bolt openings in said head assembly, first meansadapted to extend through said head bolt openings and said firstopenings to secure said plate to said head assembly, and a plurality ofspaced apart stop buttons secured to said plate and being positionedabove said top surface,

said stop buttons being positioned directly below the fuel injectorbores when said plate is secured to said head assembly whereby said stopbuttons will limit the depth to which a sleeve cutting tool can extendthrough said bores.

2. The structure of claim 1 wherein a plurality of internally threadednuts are secured to said plate which register with said first openingsand wherein said plate is adapted to be secured to said head assembly bya plurality of bolts extending through said head bolt openings and beingthreadably received by said nuts.

3. The structure of claim 1 wherein four stop buttons are provided onsaid plate.

4. The structure of claim 1 wherein three stop buttons are provided onsaid plate.

5. The structure of claim 1 wherein said stop buttons are mounted on theupper ends of threaded studs threadably extending through said plate.

6. The structure of claim 5 wherein the longitudinal axes of said studsare transverse to said top surface and are movably adjustable withrespect thereto.

References Cited UNITED STATES PATENTS 1,469,395 10/1923 Richard33174(G)UX 1,557,882 10/1925 Schade 33174(G) 1,877,477 9/1932 Gladding33180(AU) 2,270,158 1/1942 Baesgen et al 33174(G) 2,43 6,251 2/ 1948Dobie et al 29426X 2,594,810 9/1952 Schaub et a1 294'01 2,645,140 7/1953Meilstrup 33174(G) 2,897,585 8/1959 Bodewein 29401 2,928,296 3/1960Vavrinek 775 CHARLIE T. MOON, Primary Examiner US. Cl. X.R.

